PCA9517DR

Product Overview

Category: Integrated Circuit (IC)

Use: Level shifting and translating between different voltage levels in I2C bus applications.

Characteristics: - Bidirectional voltage level translation - Supports I2C bus speeds up to 400 kHz - Compatible with both 3.3V and 5V systems - Low standby current consumption - ESD protection on all pins

Package: SOIC-8

Essence: The PCA9517DR is a level translator IC designed specifically for I2C bus applications, allowing seamless communication between devices operating at different voltage levels.

Packaging/Quantity: The PCA9517DR is available in a standard SOIC-8 package. It is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.3V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Standby Current: 1µA (max)
• Rise/Fall Time: 20ns (typ)
• Output Capacitance: 10pF (typ)
• ESD Protection: ±4kV HBM, ±200V MM

Pin Configuration

The PCA9517DR features an 8-pin SOIC package with the following pin configuration:

___________ | | 1 | VCCB | 8 GND 2 | SCL1 | 7 SDA1 3 | SDA0 | 6 SCL0 4 | OE | 5 VCCA |___________|

Functional Features

• Bidirectional voltage level translation between two I2C buses operating at different voltage levels.
• Automatic direction sensing eliminates the need for additional control signals.
• Supports I2C bus speeds up to 400 kHz.
• Compatible with both 3.3V and 5V systems, allowing seamless integration into various applications.
• Low standby current consumption ensures minimal power consumption during idle periods.
• ESD protection on all pins safeguards against electrostatic discharge events.

Advantages

• Simplifies interfacing between devices operating at different voltage levels in I2C bus applications.
• Automatic direction sensing eliminates the need for complex control circuitry.
• Wide supply voltage range allows compatibility with a variety of systems.
• High-speed operation supports fast data transfer rates.
• Low standby current consumption minimizes power consumption in battery-powered applications.
• ESD protection ensures robustness and reliability in harsh environments.

Disadvantages

• Limited to level shifting and translating within the I2C bus protocol.
• Not suitable for applications requiring voltage translation beyond the specified voltage range.
• May introduce slight signal degradation due to voltage level translation.

Working Principles

The PCA9517DR utilizes a bidirectional voltage level translator to enable communication between two I2C buses operating at different voltage levels. It automatically senses the direction of data flow and adjusts the voltage levels accordingly. The device is designed to be transparent to the I2C protocol, ensuring seamless data transfer between devices.

Application Field Plans

The PCA9517DR finds application in various scenarios where voltage level translation is required in I2C bus systems. Some potential application fields include:

1. Interfacing between microcontrollers and peripheral devices operating at different voltage levels.
2. Communication between sensors and microcontrollers in IoT (Internet of Things) applications.
3. Integration of legacy I2C devices into modern systems with different voltage requirements.
4. Level shifting in mixed-voltage I2C bus systems, such as automotive electronics.

Alternative Models

For users seeking alternative options, the following level translator ICs can be considered:

1. PCA9306: Bidirectional I2C-bus and SMBus voltage-level translator with automatic direction sensing.
2. TXB0108: 8-bit bidirectional voltage-level translator with automatic direction sensing.
3. BSS138: General-purpose N-channel MOSFET used for level shifting applications.

These alternative models offer similar functionality and can be suitable replacements depending on specific requirements.

In conclusion, the PCA9517DR is a versatile level translator IC designed for seamless voltage level translation in I2C bus applications. With its bidirectional capability, compatibility with multiple voltage levels, and automatic direction sensing, it simplifies interfacing between devices operating at different voltage levels. While it has certain limitations, such as being limited to I2C bus protocol and voltage range, it offers numerous advantages and finds application in various fields.